According to Sigmund Freud, defense mechanisms are necessary for psychological well-being.

What is meant by experimenter bias? a. It is the tendency for experimenters to come from certain ethnic groups more than others. b. It is the unwanted influence of an experimenter's expectations

c. It is the experimenter's preference for doing certain experiments more than others. d. It is someone's preference for doing experiments instead of correlations.

Core knowledge about animals and people seems to develop around the age of:

a. 3 or 4 b. 7 or 8 c. 10 or 12 d. 16 or 18